linux-kernel - Re: [PATCH v1 v1 6/7] drm/vs: Add KMS crtc&plane

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Message-ID: <7sfzkc6b46izrfnhcoajllugfofh7otseocbiiftjx344hxiuf@jkjb5syqwo24>
Date:   Tue, 1 Aug 2023 14:06:06 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Keith Zhao <keith.zhao@...rfivetech.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        christian.koenig@....com, Bjorn Andersson <andersson@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Shawn Guo <shawnguo@...nel.org>, Jagan Teki <jagan@...eble.ai>,
        Chris Morgan <macromorgan@...mail.com>,
        Jack Zhu <jack.zhu@...rfivetech.com>,
        Shengyang Chen <shengyang.chen@...rfivetech.com>,
        Changhuang Liang <changhuang.liang@...rfivetech.com>
Subject: Re: [PATCH v1 v1 6/7] drm/vs: Add KMS crtc&plane

Hi,

On Tue, Aug 01, 2023 at 06:10:29PM +0800, Keith Zhao wrote:
> +static int vs_crtc_atomic_set_property(struct drm_crtc *crtc,
> +				       struct drm_crtc_state *state,
> +				       struct drm_property *property,
> +				       uint64_t val)
> +{
> +	struct vs_crtc *vs_crtc = to_vs_crtc(crtc);
> +	struct vs_crtc_state *vs_crtc_state = to_vs_crtc_state(state);
> +
> +	if (property == vs_crtc->sync_mode)
> +		vs_crtc_state->sync_mode = val;
> +	else if (property == vs_crtc->mmu_prefetch)
> +		vs_crtc_state->mmu_prefetch = val;
> +	else if (property == vs_crtc->bg_color)
> +		vs_crtc_state->bg_color = val;
> +	else if (property == vs_crtc->panel_sync)
> +		vs_crtc_state->sync_enable = val;
> +	else if (property == vs_crtc->dither)
> +		vs_crtc_state->dither_enable = val;
> +	else
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static int vs_crtc_atomic_get_property(struct drm_crtc *crtc,
> +				       const struct drm_crtc_state *state,
> +				       struct drm_property *property,
> +				       uint64_t *val)
> +{
> +	struct vs_crtc *vs_crtc = to_vs_crtc(crtc);
> +	const struct vs_crtc_state *vs_crtc_state =
> +		container_of(state, const struct vs_crtc_state, base);
> +
> +	if (property == vs_crtc->sync_mode)
> +		*val = vs_crtc_state->sync_mode;
> +	else if (property == vs_crtc->mmu_prefetch)
> +		*val = vs_crtc_state->mmu_prefetch;
> +	else if (property == vs_crtc->bg_color)
> +		*val = vs_crtc_state->bg_color;
> +	else if (property == vs_crtc->panel_sync)
> +		*val = vs_crtc_state->sync_enable;
> +	else if (property == vs_crtc->dither)
> +		*val = vs_crtc_state->dither_enable;
> +	else
> +		return -EINVAL;
> +
> +	return 0;
> +}

Any new property needs to follow these requirements:
https://docs.kernel.org/gpu/drm-kms.html#requirements
https://docs.kernel.org/gpu/drm-uapi.html#open-source-userspace-requirements

Also, most of them are suspicious, like sync_mode, mmu_prefetch,
panel_sync or dither_enable. Why would you want userspace to change
those ?


> +static int vs_crtc_late_register(struct drm_crtc *crtc)
> +{
> +	return 0;
> +}

You can drop that.

> +static int vs_crtc_enable_vblank(struct drm_crtc *crtc)
> +{
> +	struct vs_crtc *vs_crtc = to_vs_crtc(crtc);
> +
> +	vs_dc_enable_vblank(vs_crtc->dev, true);
> +
> +	return 0;
> +}
> +
> +static void vs_crtc_disable_vblank(struct drm_crtc *crtc)
> +{
> +	struct vs_crtc *vs_crtc = to_vs_crtc(crtc);
> +
> +	vs_dc_enable_vblank(vs_crtc->dev, false);
> +}
> +
> +static const struct drm_crtc_funcs vs_crtc_funcs = {
> +	.set_config		= drm_atomic_helper_set_config,
> +	.page_flip		= drm_atomic_helper_page_flip,
> +	.reset			= vs_crtc_reset,
> +	.atomic_duplicate_state = vs_crtc_atomic_duplicate_state,
> +	.atomic_destroy_state	= vs_crtc_atomic_destroy_state,
> +	.atomic_set_property	= vs_crtc_atomic_set_property,
> +	.atomic_get_property	= vs_crtc_atomic_get_property,
> +	.late_register		= vs_crtc_late_register,
> +	.enable_vblank		= vs_crtc_enable_vblank,
> +	.disable_vblank		= vs_crtc_disable_vblank,
> +};
> +
> +static u8 cal_pixel_bits(u32 bus_format)
> +{
> +	u8 bpp;
> +
> +	switch (bus_format) {
> +	case MEDIA_BUS_FMT_RGB565_1X16:
> +	case MEDIA_BUS_FMT_UYVY8_1X16:
> +		bpp = 16;
> +		break;
> +	case MEDIA_BUS_FMT_RGB666_1X18:
> +	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
> +		bpp = 18;
> +		break;
> +	case MEDIA_BUS_FMT_UYVY10_1X20:
> +		bpp = 20;
> +		break;
> +	case MEDIA_BUS_FMT_BGR888_1X24:
> +	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
> +	case MEDIA_BUS_FMT_YUV8_1X24:
> +		bpp = 24;
> +		break;
> +	case MEDIA_BUS_FMT_RGB101010_1X30:
> +	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
> +	case MEDIA_BUS_FMT_YUV10_1X30:
> +		bpp = 30;
> +		break;
> +	default:
> +		bpp = 24;
> +		break;
> +	}
> +
> +	return bpp;
> +}
> +
> +static bool vs_crtc_mode_fixup(struct drm_crtc *crtc,
> +			       const struct drm_display_mode *mode,
> +			       struct drm_display_mode *adjusted_mode)
> +{
> +	struct vs_crtc *vs_crtc = to_vs_crtc(crtc);
> +
> +	return vs_dc_mode_fixup(vs_crtc->dev, mode, adjusted_mode);
> +}

You should be using atomic_check.

Maxime

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